Kurumu and Tsukune's Romantic Adventure!

AU. Instead of only meeting Moka, Tsukune's first encounter with youkai includes Kurumu as well. After that incident and learning that he's a human, the duo take him under their wing. Meanwhile, Tsukune resolves to learn more about them and about the wider world of youkai, not only for survival, but also for friendship, and maybe more if a certain succubus has her way...